I used to have one dipstick for the R22 i had a few years ago, had AUX in RED one one side and main in Blue on the otherl. That wasn't a factory item. I think the factory supply two with different scales, one for each tank.
I also seem to recall that Mini ( from the 60s-90s car) fuel caps fit R22s and possibly R44s. As to whether its acceptable to use them is another matter !